216747219

Appears in sequences

• Least positive integer k such that the fractional part of k*sqrt(5) has its n initial partial quotients all equal to 1.at n=19A004794
• Least positive integer k such that the fractional part of k*sqrt(5) has its n initial partial quotients all equal to 1.at n=20A004794
• a(n) = floor((Fibonacci(2*n+1)+1)/2).at n=21A087953
• a(n) = floor[(phi + n mod 2)*a(n-1)], a(1)=1.at n=28A107857
• a(n) = b(k), where b(k) = Fibonacci(n-1) and k = floor( n*(1+sqrt(5))/2 ).at n=28A107858
• Antidiagonal sums of number triangle A086645.at n=21A108479
• Expansion of (1-3*x)/(1-5*x+3*x^2+x^3).at n=14A232970
• a(n) = 3*a(n-1) + 5*a(n-2) + a(n-3), with a(0) = a(1) = 1 and a(2) = 7, a linear recurrence which is a trisection of A005252.at n=14A294262
• Numbers k such that the k-th centered 40-gonal numbers (A195317) is a square.at n=14A351354